Stay-bolt structure.



B. E. D. STAFFORD & E. 0000s.

STAY BOLT STRUCTURE.

{LED N AP B. 1,252,39. Patent-edJan. 1, 1918;

vNo. 83,146.

The object of our present invention'isto,

sm rom ravcr 'ee Specification of Letters gate t.

BENJAMIN E. n. srarronna vn er-nan I. norms, or rrrrsnonerr, rnnsvrvama, essroivonsro FLANNERY BOLT COMPANY, or rrrrseonerr,BENN$YLVANIA.

Patented Jan. 1918! Original application filed March 9, 1916, Seria1 No.83,146. Divided and tl -is application filed November 7,

1916. .Serial No. 130,047.

To all wkom'z't may concern v I Be it known that we, BENJAM1IN E.' D.STAFFORD and ETHAN I.--DoDDs, citizens of the United States, andresidents of Pittsburgh, in thecounty of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements in,StayiBolt Structures; and we do, hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled the art tov which it appertains to make and use thesame.v

This invention relates to improvements in stay bolt structures for'boilers'and more particularly to means for testing the integrity of thestay bolts of boilers,this application being a division of anapplication for patent filed-by us. on. the 9th day of March, 1916, anddesignated by Serial provide simple and eflicient means which shall beaccessible for testing purposes without removing any part of connectingmeans for the bolt.

In the accompanying drawings; Figure 1 is a sectional view showing anembodiment of our invention and Figs. 2, 3, 4, 5, 6 and 7 are viewsillustrating modifications thereof.

1 represents an outer boiler sheet having a. hole for the accommodationof a bearing sleeve 2,said sleeve being externally threaded at 3 toscrew into the hole in the boiler sheet and the upper or outer portionof the threaded sleeve receives the internally threaded portion of a cap4, the latter being also formed with a shoulder 5 which may rest againstthe end of the sleeve 2. The sleeve 2 is formed interiorly with a seat 6for the rounded or spherical head 7 of a stay bolt 8 and said head ismade with a slot 9 to receive the tongue 10 of a driving member 11.

In the embodiment of our invention illustrated in Fig. 1, the cap 4: ismade with a central enlargement 12 having an opening therein formed withcurved walls to provide a partly spherical seat 13 for the sphericalbody of the rotary or driving member 11, the latter also being providedwith an angular portion or head 14 to receive a wrench.

The purpose of our invention is to provide readily accessible meanswhereby a turning force may be applied to a stay bolt v-togeth'er. V I

In Fig. 3, a hemispherical cap 17 is shown,

without removing the cap or any part. of the attaching means for thebolt, so that it .may be atonce determined whether the bolt is broken.When the bolt-is to be tested, the operator will apply. a suitablewrench to the angularhead 1 1 of the driving member 11 an d apply aforcethereto tending to turn sa d driving member, such force beingtransmitted to the bolt throughthe medium of the tongue 10-- of saiddriving member which enters the slot in the bolt head. Should the saiddriving member refuse to turn, this'f act will indicate that the bolt iswhole, but should said member turn when rotary force is applied thereto,this fact will at once-indicate that the bolt is broken.

Fig. 2 shows a construction similar-to that shown in Fig. 1, except thatin Fig. 2, the cap is made in two parts 15, 16 screwed and this isprovided with an opening 18 for the accommodation of the rotary ordriving member 19, the latter being formed with a convex portion 20hearing against the inner face of the cap and with a threaded portion 21to receive a nut 22 having a concave face to rest against the outerconvex face of the cap. The outwardly projecting portion 21 may beprovided with a slot 23 to receive a screw driver.

The construction shown in Fig. 4 embodies a cap 24 having an angularexterior with a fiat outer face and a nut 25 on the rotary or drivingmember 26 rests against said flat outer face of the cap.

In the construction shown in Fig. 5, the cap 4: is made with acomparatively large central opening closed by a rotary or driving member27 having a beveled portion 28 bearing against the inner face of the capand provided with a tongue 29 to engage the slot of the bolt head. Aring or washer 30 encircles the neck portion of the member 27 and restsagainst the cap 4. The member 27 is provided with bendable lugs 31 whichare made to engage the ring 30, and thus said member is coupled to thecap 26. A central enlargement 32 is provided on the rotary or drivingmember 27 to receive a tool for turning the same.

In the form of the invention shown in Figs. 6 and 7, the rotary drivingmember is made with a head 33 having a shoulder 34,

and a driver slot split ring3 6 Edie posed between the shoulder 34: ofthe head 33 and'the cap 37.

Various other changes might be made "in I the details of construction ofour invention without departing from the spiri't'thereof' or limitingits scope and hence we dornot,

wish torestrictourselve's to theprecise details-herein? set-forthexcept-as defined the scope of the appended claims. r

7 Having fully described our invention what we'clailn as new and desire"to secure by Letters Patent, is I V 1. A stay bolt structure comprisinga stay bolt,'a cap over the end'of the same,and a rotary member having apart' dispos'ed within the cap and operatively associated member. 1

e .2. A stay bolt structure comprising astay' bolt havihgaslotted head,a cap over said head, a rotary member-having'a partprojectingthrouglrthe cap for the reception fiopie-s of thin patent maybe obtained for five cents eachQby addressing the Gonimissionerloflatents; v l Washingtoml). 0..

of a tool, and said rotary part having a tongue to engage the slottedhead. 3. A staybolt structurecomprising a stay rotary member. I .v H W s4. In a stay bolt structure, the combination with a stay bolt, and a capover the bolt having a slotted head, a cap over said head, and a rotarymember having a part engaging the cap and a part-to engage in the slotin the'bolt head, the last-mentioned partof the rotary member and theslot in the bolt head being so relatively proportioned that the bolt mayhave longitudinal and lateral movement independently of said endof thesame, of means Within saidcap and rotative independently thereoffor'applyingrotary pressure ito'the'bolt. I

5.111 a stay bolt structure, thecombina tion with a stay bolt, and a capover the end of the same, of means within said cap and rotativeindependently thereof for applying rotary pressure to the bolt, saidmeans'having atool receivingpart which is accessible without removal ofthecap. I 4 In testimony whereof, we'have signed this specification'inthe presence of 'two sub- :scribin witnesses. V isENJAMIN 1 3,1);STAFFORD. ETHAN IqDODDSa I Witnesses: V I F. H ALLIsoN, EDWIN SPENCERRYoE. 7

